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Hydrophobic modification method of nanocellulose

A technology of nanocellulose and hydrophobic modification, applied in the field of hydrophobic modification of nanocellulose, can solve the problems of complicated steps, high preparation cost, harsh conditions, etc., and achieve the effects of simple preparation process, no environmental pollution, and simple operation.

Active Publication Date: 2017-11-24
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Several methods for preparing hydrophobic cellulose materials reported above are realized by blending, liquid-phase chemical modification, surface coating, thermal degradation, etc. The steps are cumbersome, the conditions are harsh, and it is difficult to retain the original excellent properties of the material. , the post-treatment process is complicated, the preparation cost is high, and it is difficult to achieve large-scale production

Method used

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  • Hydrophobic modification method of nanocellulose
  • Hydrophobic modification method of nanocellulose
  • Hydrophobic modification method of nanocellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The cellulose nanocrystals are prepared according to the traditional method of hydrolyzing cellulose with sulfuric acid and dried by a freeze dryer. Place the cellulose nanocrystals in a desiccator, place a small petri dish at the bottom of the desiccator, add 5 mL of hexamethyldisilazane to it, evacuate the desiccator, put it in an oven at 75°C and heat it for 2 hours. Take it out and cool to room temperature to obtain hydrophobic nanocrystalline cellulose with a water / air contact angle of 121°, such as figure 2 Shown. The device according to the invention is figure 1 Shown.

[0027] image 3 This is a photograph of the cellulose nanocrystals prepared in Example 1 of the present invention that selectively absorb water and chloroform. It can be seen from the figure that the modified cellulose nanocrystals have a greatly reduced affinity for water, but have good absorption for organic solvents.

Embodiment 2

[0029] The cellulose nanocrystals are prepared according to the traditional method of hydrolyzing cellulose with sulfuric acid and dried by a freeze dryer. Place the cellulose nanocrystals in a desiccator, place a small petri dish at the bottom of the desiccator, add 5 mL of hexamethyldisilazane to it, evacuate the desiccator, put it in an oven at 75°C and heat it for 2 hours. Take it out and cool to room temperature to obtain a hydrophobic nanocrystalline cellulose aerogel with a water / air contact angle of 125°.

Embodiment 3

[0031] The cellulose nanocrystals are prepared according to the traditional method of hydrolyzing cellulose with sulfuric acid and dried by a freeze dryer. Place the cellulose nanocrystals in a desiccator, place a small petri dish at the bottom of the desiccator, add 5 mL of methyltrimethoxysilane to it, evacuate the desiccator, put it in an oven at 75°C and heat for 2 hours, then take it out Cool to room temperature to obtain hydrophobic nanocrystalline cellulose with a water / air contact angle of 132°, such as Figure 4 Shown.

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Abstract

The invention discloses a hydrophobic modification method of nanocellulose. The method comprises the steps of putting the nanocellulose into a dryer, placing a small-sized open container at the bottom of the dryer, adding 5-10mL of a silanization agent, vacuating the dryer, putting the dryer into a drying oven and heating for a period of time so as to obtain a hydrophobic modified nanocellulose material. The hydrophobic modification method fully utilizes a chemical vapor deposition method, and the hydrophobic modified nanocellulose is directly prepared by using an in-situ reaction one-step method; the types of silanization agents which can be selected for use are wide, the solvent pollution is avoided, a complicated aftertreatment process is omitted, and the original good properties of the material can be maintained. The hydrophobic modification method provided by the invention is simple in preparation technology, free from environmental pollution and low in cost; the prepared hydrophobic modified nanocellulose is safe and biodegradable, thus being capable of being used in the fields such as chemical industry, food, environmental protection, textile and separation.

Description

Technical field [0001] The invention relates to the field of natural polymer science and materials, in particular to a method for hydrophobic modification of nano cellulose. Background technique [0002] For thousands of years, cellulose has been used in the fields of energy, materials, construction, clothing, etc. in the form of wood and plant fibers. It is a key source of sustainable materials in industrial production, such as the use of viscose technology to produce man-made fibers and filaments, and Through the mass production of cellulose esters and ethers, new materials such as coatings, foods, and medicines are prepared. With the development of science and technology, manipulating cellulose molecules in the nanometer size range to prepare new nanomaterials with excellent functions has become the frontier field of cellulose science. [0003] Nanocellulose has many excellent properties, such as high purity, high degree of polymerization, high crystallinity, high Young's modul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B15/05
CPCC08B15/05
Inventor 周金平喻丽莎
Owner WUHAN UNIV
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